Page 58 - Invasive_Species_2013

Mediterranean invasive species factsheet

CNIDARIANS

Reproduction Common name: Nomad jellyfish

identification

Scientific Name:
Rhopilema nomadica
Picture

Key identifying features Brief history
This solid, large jellyfish is light blue in colour with
tiny granules on the bell. The bell of this jellyfish can
range from 10 to 90 cm in diameter, usually 40–60
cm, and the whole animal can weigh 40 kg. Hanging
from the centre are eight large mouth-arms divided at
mid-length into two ramifications with numerous long
filaments.
Reproduction
Its life cycle involves a small (usually < 2 mm)
Field identification signs and habitat benthic polyp stage that reproduces asexually, and a
This species can form dense aggregations in coastal large swimming medusa stage that reproduces
areas during summer months, although it can also sexually. Spawning usually occurs in July and
appear all year round. August.

Rhopilema nomadica. Photo: D. Edelist Rhopilema nomadica. Photo: Ori

Monitoring Marine Invasive Species in Mediterranean MPAs: A strategy and practical guide for managers 55